METHOD FOR DYNAMIC DETECTION OF ACCIDENTAL ELECTRIC DISCHARGE AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2014 - IPC H02H3/00 

FIELD: electricity.

SUBSTANCE: application: in the field of electric engineering. According to the method a recorded signal i(t) of load current is supplied into two channels, each channel has three processing steps, at that at the first step of the first channel deviation of current signal from the periodic function is assessed, a regular component being the determinate part of the source signal is then defined by means of the source signal averaging in a short period of time - more than ten times less than the reporting period T and its mean-square value is calculated; at the second step high frequency components are defined excluding signal components slowly varying during several reporting periods T; at the third step the signal is filtered in order to exclude influence of certain pulses with large amplitude and history of its previous values is considered for the long-term period of time with reduction of each value contribution into the result depending on its time limitation; at that at the first step of the second channel an irregular component is defined by means of a regular component deduction from the signal i(t) and its mean-square value is calculated; at the second step high frequency components are defined and at the third step the signal is filtered, signal levels obtained at the outputs of the first and second channels are compared with the preset threshold values and when they exceed these values an alarm command is generated in order to cut off the controlled mains.

EFFECT: improving reliability.

8 cl, 4 dwg